<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title> constructor & prototype & __proto__ </title>
</head>
<body>
    <script>
    	(function () {
    		console.log(this);
    	})();

    	(function () {
    		"use strict";
    		console.log(this);
    	})();

    	function conA() {
    		this.yes = function () {
    			console.log(this);
    		};
    	}
    </script>
</body>
</html>